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For the creation of the object’s “Signed Distance Field” (SDF), its bounding box is used. The SDF determines whether an interacting particle is inside or outside the object, or on its surface. With this parameter you can easily extend that bounding box to improve particle-object collision, for example in combination with the “Waterline” emitter. An increased SDF might change the simulation, because the solver will “see” the object earlier. This value is given in metres [m].
Please bear in mind that other parameters, e.g. the domain's “Cell size”, will be taken into account as well to calculate the object's final volume.
Volume mode
You can choose from three different options. The default setting is “Solid inside” and the body acts like a completely filled object. Particles react with the node outside and bounce from its surface. With “Solid outside”, the object is hollow, while everything around its borders is considered solid. A Hybrido fluid that is created inside such an object will be trapped and cannot leave the body. Finally, there is “Shell”. In this case, the object acts like a non-solid, hollow body. Fluids inside the object will not be able to leave it, while fluids from the outside are reflected at its borders. A balloon is a good example of an object in “Shell” mode. When "Shell" is used, RealFlow adds an offset above and below the object's surface to make sure that the particles will not interpenetrate the object. The size of this offset is
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